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Anaerobic co-digestion of sludge and microalgae grown inmunicipal wastewater – feasibility study
Mälardalen University, School of Business, Society and Engineering, Future Energy Center.ORCID iD: 0000-0002-0861-6438
Swedish University of Agricultural Sciences, Sweden.
Swedish University of Agricultural Sciences, Sweden.
Mälardalen University, School of Business, Society and Engineering, Future Energy Center.ORCID iD: 0000-0002-8034-4043
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(English)In: Water Science and Technology, ISSN 0273-1223, E-ISSN 1996-9732Article in journal (Refereed) In press
Abstract [en]

In this study a natural mix of microalgae grown in wastewater of municipal character was co-digested with sewage sludge in mesophilic conditions, in both batch and semi-continuous modes. The semicontinuous experiment was divided into two periods with OLR 1 (Organic Loading Rate) of 2.4 kg VS m3 d-1 and HRT1 (Hydraulic Retention Time) of 15 days, and OLR2 of 3.5 kg VS m3 d-1 and HRT2 of 10 days respectively. Results showed stable conditions during both periods. The methane yield was reduced when adding microalgae (from 200 ± 25 NmL CH4 g VSin-1 , to 168±22 NmL CH4 g VSin-1). VS reduction was also decreased by 51%. This low digestability was confirmed in the anaerobic batch test. However, adding microalgae improved the dewaterability of the digested sludge. The high heavy metals content in the microalgae resulted in a high heavy metals content in the digestate, making it more difficult to reuse the digestate as fertilizer on arable land. The heavy metals are thought to originate from the flue gas used as a CO2 source during the microalgae cultivation. Therefore the implementation of CO2 mitigation via algal cultivation requires careful consideration regarding thesource of the CO2-rich gas.

Keyword [en]
Biogas, dewaterability, Gompertz model, mesophilic, semi-continuous study, waste activated sludge
National Category
Renewable Bioenergy Research Water Engineering
Research subject
Energy- and Environmental Engineering
Identifiers
URN: urn:nbn:se:mdh:diva-37381DOI: 10.2166/wst.2017.583OAI: oai:DiVA.org:mdh-37381DiVA: diva2:1162359
Projects
MAASICA-projektet
Funder
Knowledge Foundation
Available from: 2017-12-04 Created: 2017-12-04 Last updated: 2017-12-05

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Olsson, JesperZambrano, JesusSchwede, SebastianNehrenheim, EmmaThorin, Eva

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